Do cats need vertical space, or is that just marketing?

Do cats need vertical space is a reasonable question to ask sceptically, because the phrase "vertical space" does a lot of commercial work. It appears in product copy far more often than in veterinary documents, and it has the useful property of being satisfied by whatever the seller happens to be selling.

So this article does the dull thing. It goes to the published guidance, quotes it as written, and then separates three claims that usually arrive bundled together:

1. Cats benefit from access to elevated resting places.
2. Therefore your cat needs more height than it currently has.
3. Therefore you should buy a piece of vertical furniture.

The first is supported. The second depends entirely on your home. The third does not follow from either.

What the guidelines say, quoted properly

The reference document is the 2013 AAFP and ISFM Feline Environmental Needs Guidelines, from the American Association of Feline Practitioners and the International Society of Feline Medicine. It is free. The full PDF and its landing page are both public.

The document is built on five pillars, which it states as:

1. Provide a safe place.
2. Provide multiple and separated key environmental resources: food, water, toileting areas.
3. Provide opportunity for play and predatory behaviour.
4. Provide positive, consistent and predictable human and cat social interaction.
5. Provide an environment that respects the importance of the cat's sense of smell.

Note what is and is not in that list. There is no pillar called "vertical space." Height appears inside pillar one, which is about safety. The guidelines describe a safe place as "a private and secure area, often in a raised location," and then give the operative sentence: "Access to an elevated area increases the cat's vertical space and allows it to monitor its environment."

They add two specifics about the elevated place itself. "Perches should be wide enough and long enough to allow the cat to fully stretch." And "a hammock-style dip in the middle of the perch or shelf will aid the cat's sense of feeling hidden."

They also set a quantity, and it is about choice rather than height. "A cat should have a choice for each resource," with "a minimum of two resting areas, two feeding areas," and at least as many safe places, "sized to hold a single cat, as there are cats in a household."

So the supported claim is narrower and more specific than "cats need vertical space." It is: cats benefit from having a choice of resting places, at least one of which is raised, secure, and large enough to lie stretched out on.

The second source says the same thing without the slogan

Herron and Buffington's review of environmental enrichment for indoor cats, published in Compendium in 2010 and hosted by the Ohio State Indoor Pet Initiative, states that "domestic cats naturally climb for observation and safety," that "cats also need perching options throughout the household," and that these should "offer vantage points that are safe from people and other animals." It also records that cats "seem to prefer comfortable resting options, such as pillows or fleece beds," and that indoor cats need "unrestricted access to resting areas."

Again, the emphasis is on access, comfort, safety and number. The word "climb" is there, which matters, and we will come back to it, because climbing is a thing a shelf does not provide.

How strong is the evidence, honestly

Not as strong as the confidence of the average product page implies.

Wagner, Hurley and Stavisky's 2018 paper on shelter housing for cats in the Journal of Feline Medicine and Surgery states that "ideally, all enclosures should include an elevated vantage point" and that "cats prefer to have an elevated position, which can be a problem in lower housing units." The authors cite no specific study for that preference claim. They also say, in the paper itself, that the evidence base for shelter design is "relatively small" and that some recommendations rest on expert opinion. The PDF is public.

That is the right way to describe this literature. It is consensus professional guidance from specialists in feline medicine, converging from several directions, and it is not a body of randomised trials on shelf height. Consensus guidance is good evidence. It is not the same thing as a measured effect size, and anyone who tells you there is a proven number of inches is inventing it.

There is also one owner survey finding that actively complicates the furniture story. Wilson et al. (2016), the largest published owner survey on cat scratching behaviour with 4,105 qualifying respondents, found that cats used wall-mounted posts least of the options offered, with multi-level cat trees and simple upright posts used most. Among owners whose cats used a wall-mounted post, 74.1 percent reported unwanted scratching elsewhere in the home, compared with 55.3 percent for cats using a tree with one or more levels. There is a free full text.

That is about scratching posts, not beds, the wall-mounted subgroup was only 81 cats, and association is not cause. But it is a published result where a wall-mounted vertical product came last, and it belongs in any honest answer to this question. We sell a wall-mounted perch. We are telling you anyway.

What actually follows for your house

Here is the useful translation.

Count your cat's existing elevated resting places. Not surfaces it could theoretically reach. Places it actually lies down. The top of the sofa back. A windowsill. A bed. A bookshelf it has cleared a space on. The kitchen counter you pretend it does not use.

If the answer is two or more, in different locations, and at least one is secure and big enough to stretch out on, you already satisfy the guidance. You do not need to buy anything. Adding a third option may still be pleasant for your cat. It is not a deficiency being corrected.

If the answer is zero or one, you have a real gap, and the cheapest fixes come first:

• Clear the top of a cupboard or a bookcase and put a folded blanket on it.
• Move a chair so that it forms a step to a surface the cat cannot currently reach.
• Open a route: a cat cannot use the top of a wardrobe if nothing beside it is climbable.
• Check that the elevated places you do have are not all in one room.

None of that costs money. Most of the benefit described in the guidelines is available through furniture arrangement, which is not something you will read on a product page.

Buy something when the geometry of the room genuinely blocks the free fixes. Narrow or sloped sills. Radiators under every window. No clear high surface. Two cats competing over a single good spot. A room where the only way to add height is to attach something to a wall or stand something on the floor.

Vertical space is not one need

The last distinction, and the one that most often gets collapsed.

Herron and Buffington's phrase is that cats "naturally climb for observation and safety." Climbing and observing are two behaviours. A wall-mounted shelf serves the observing. It does not serve the climbing at all: a cat gets onto it in one movement and that is the end of the athletic content.

If what your cat wants is a lookout, a shelf at the right window is efficient and uses no floor. Ours is $69, a board on two steel legs with a removable washable cushion, and it bolts to the wall. If what your cat wants is to climb and to scratch, the survey above points at a cat tree, and our cat perch or cat tree comparison works through which constraint decides it. If your floor space is the problem rather than your wall, we have written up cat furniture for a small apartment.

And if you read all of that and conclude your cat already has what the guidelines describe, that is a correct conclusion and we would rather you reached it here than after a purchase. The broader argument, including placement, is in our cat window perch guide.